<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert 
                title="注意：只允许为第三级分类设置相关参数" 
                type="warning"
                :closable="false"
                show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                        expand-trigger="hover"
                        v-model="selectedCateKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环现实的标签 -->
                                <el-tag 
                                    closable 
                                    v-for="(item, i ) in scope.row.attr_vals" 
                                    :key="i"
                                    @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态参数的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button size="mini" type="primary" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环现实的标签 -->
                                <el-tag 
                                    closable 
                                    v-for="(item, i ) in scope.row.attr_vals" 
                                    :key="i"
                                    @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
            <!-- 添加参数的表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数对话框 -->
        <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed">
            <!-- 添加参数的表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return {
            //商品分类列表
            catelist:[],
            //级联选择框配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双项绑定的数据
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数数据
            manyTableData:[],
            //静态属性数据
            onlyTableData:[],
            //控制对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{},
            //校验规则
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制编辑对话框的显示与隐藏
            editDialogVisible:false,
            //编辑参数的表单属表单对象
            editForm:{},
            //表单数据验证
            editFormRules:{
                 attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            }
        }
    },
    created(){
        this.getCateList()
    },
    computed:{
        //如果需要被禁用true，否则false
        isBtnDisable(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        //当前选择的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    },
    methods:{
        //获取所有的商品列表
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error("获取分类列表失败")
            }
            this.catelist = res.data;
            console.log(this.catelist);
        },
        //获取参数列表
        async getParamsData(){
            //console.log(this.selectedCateKeys);
            //证明不是选择三级分类
            if(this.selectedCateKeys.length !==3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //证明选择的是三级分类
            //console.log(this.selectedCateKeys);
            //根据所选分类的id，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })
            if(res.meta.status !==200){
                return this.$message.error('获取参数列表失败')
            }

            res.data.forEach( item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本款的显示与隐藏
                item.inputVisible = false
                //文本框输入的值
                item.inputValue = ''
           })

            console.log(res.data);

            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        //级联选择框选择项发生变化，触发的事件
        handleChange(){
            this.getParamsData()
        },
        //tab 页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },
        //对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //添加参数操作
        async addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} =await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加属性失败')
                }
                this.$message.success('添加属性成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        //编辑列表数据展示
        async showEditDialog(attrId){
            this.editDialogVisible = true
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`)
            if(res.meta.status !== 200){
                return this.$message.error('参数查找失败!')
            }
            this.editForm = res.data
        },
        //编辑参数
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return 
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error('参数更新失败')
                }
                this.$message.success('参数更新成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //编辑参数对话框的关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //根据id删除删除对应的参数
        async removeParams(attrId){
            //弹框询问用户是否删除用户
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                showCancalButton: true,
                showConfirmButton:true,
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            //如果用户确定，则返回字符串confirm
            //如果用户取消了删除，则返回字符串cancel
            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }   

            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
            if(res.meta.status !== 200){
                return this.$message.error('参数删除失败！')
            }
            this.$message.success('参数删除成功！')
            this.getParamsData()
       },
       //文本框失去焦点 或者 按钮enter键 触发的事件
       async handleInputConfirm(row){
           if(row.inputValue.trim().length === 0 ){
               row.inputValue = ''
               row.inputVisible = false
               return
           }
           //如果没有return ,则证明输入的内容需要做后续处理
           row.attr_vals.push(row.inputValue.trim())
           row.inputValue = ''
           row.inputVisible = false
           this.saveAttrVals(row)
           console.log('ok');
       },
       //将对Attr_vals的操作保存到数据库
        async saveAttrVals(row){
            //需要发起请求，保存参数
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
       //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获得焦点
            //$nextTick方法的作用：就是当页面上元素被重新渲染后，才会指定毁掉函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除参数选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 100px;
}
</style>